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Give the decreasing pH of aqueous soluti...

Give the decreasing `pH` of aqueous solution of the following compounds :
a. `NaCl` , b. `MgCl_(2)` , c. `AlCl_(3)` , d. `PCl_(5)`

A

`NaCl lt MgCl_(2) lt AlCl_(3)`

B

`MgCl_(2) lt NaCl lt AlCl_(3)`

C

`AlCl_(3) lt MgCl_(2) lt NaCl`

D

`NaCl lt AlCl_(3) lt MgCl_(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
Cation size is decreasing in the order :
` Na^(+) gt Mg^(2+) gt Al^(3+)`
`Al^(3+)` has maximum polarisation effect and `Na^(+) ` has minimum polarisation effect .
The covalent nature is in the order :
` AlCl_(3) gt MgCl_(2) gt NaCl`
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